Core Activation vs. Core Capacity: The Difference That Matters

· Oppdatert

Core activation and core capacity are not the same. Understanding the difference can make core training more effective, meaningful and relevant — both for injury prevention and performance.

When you search for core training online, you will find thousands of exercises. Most of them do not explain what you are actually training. -Is the goal simply to “activate” or “wake up” the muscles, or is it to build real capacity of the core muscles? These are two fundamentally different processes, and they require different approaches. Understanding why we do what we do in training can make the training more meaningful — and that can also increase motivation.

What is core activation?

Core activation is about stimulating and challenging the body so that the core muscles are activated beyond the level they normally reach in everyday life. It is mainly a neuromuscular response: the right muscles increase activity when the body needs them. This often happens through reflex activity and/or outside conscious control.

A classic example is the deep abdominal muscle transversus abdominis. In people without back pain, this muscle typically fires milliseconds before the arms or legs move. This is called a feedforward mechanism — a programmed pre-activation. In people with neck pain, this signal is often delayed (Falla et al., 2004). Similar findings have been documented in low back pain by Hlaing and colleagues in a 2021 study published in BMC Musculoskeletal Disorders.

Hlaing and colleagues compared 36 people with subacute low back pain over four weeks. One group trained low-threshold activation of transversus abdominis and the lumbar multifidus muscles — the small, deep muscles of the lower back — while the other group performed traditional strengthening exercises. The activation group showed significantly better proprioception, meaning the body’s ability to sense joint position, as well as better balance.

Activation can also occur spontaneously through reflex activity during balance challenges, for example through exercises on unstable surfaces. It does not necessarily require heavy load, many repetitions or long holding time. One simple physiological explanation is that the nerve cells controlling the muscles can be moved from a resting state into a more active state through plateau potentials (Kiehn & Eken, 1998).

Our aim is to promote relaxed and often playful balance training, that feels safe and helps move focus away from fear of worsening previous pain, such as low back pain. Through a low-threshold and mastery-oriented approach, coordination, timing and dynamic stabilization can improve. The purpose is to increase the activation level of the core muscles — both how early they fire and how strongly they fire, as reflected in increased EMG activity.

Modern lifestyles mean that many of us do not activate our core muscles in the same way people have done in the past - due to active living. One estimate suggests that around 5.5 billion people do not meet public health recommendations for weekly physical activity. This may contribute to reduced activity in the core musculature.(An AI estimate based on WHO, the Norwegian Directorate of Health, the Norwegian Institute of Public Health, Dagens Medisin, ScienceDirect, Springer Link, NHS UK, NIH, forskning.no, Wiley, CDC, MDPI, BMJ, dfo.no, europa.eu, ResearchGate, PLOS, BioMed Central, muskelskjeletthelse.no, JFSF, unit.no and skadefri.no.

What is core capacity?

Core capacity is the ability of the neuromuscular system to stabilize parts of the body — often the body’s base, including the spine and pelvis — while at the same time producing force and movement in the core and other parts of the body. Both are crucial for total force production and influence physical performance.

Our understanding - and our own research indicate that the core is not only a place where force is transferred. The core is also capable of force production. We like to view the core as a “powerhouse”. This is an important potential that we use when developing core capacity.

To increase core capacity, systematic training is needed. This means progressive loading or more demanding exercises in terms of movement patterns and/or balance. We know that muscles can become significantly weakened through atrophy, and both load and recovery must be considered when rebuilding muscle strength. This also applies to the core musculature, which can become weak and partly replaced by fat and connective tissue. On MRI-scans, this appearance has been described as “moth-eaten” (McPartland, 1997).

Gottschall and colleagues showed in a 2013 study in the Journal of Strength and Conditioning Research that the choice of exercise matters. They measured muscle activity in 20 healthy students during 16 different core exercises. Integrated exercises — exercises that require simultaneous activation of the abdominal muscles, back, shoulders and hips — produced 27% higher abdominal muscle activity than a traditional crunch. The mountain climber produced higher abdominal activity than a standard forearm plank. In other words, the body activated more muscles at the same time, and the muscles worked harder.

Core capacity is better built when you challenge the system as a whole, not just isolated parts of it.

Why are the terms often mixed together?

Many activation exercises also build some strength, and many strength exercises create reflex activity. But the intention and the dose are different.

A dynamic stabilization exercise performed with low load for 10 seconds, with the goal of “waking up” one or more core muscles, is activation. The same exercise, performed with higher load and possibly higher level of difficulty, using a low number of reps, becomes capacity training. It may be the same exercise, but the physiological response and training effect are different.

Kibler and colleagues emphasized this already in 2006 in a review article in Sports Medicine. They described the core as an integrated system and defined core stability as the ability to control the position and movement of the trunk over the pelvis. The body needs only about 5% of maximal muscle activation for everyday activities, and around 10% for powerful movements. Lack of strength is therefore rarely the only problem. More often, it is timing and control that fail.

When do you need activation, and when do you need capacity?

An activated core is essential for pain-free function over time in all types of activity. Inactivity, static or repetitive work, mental stress, lack of balance stimulus and limited movement variation can all contribute to reduced core muscle activation.

(Sources: WHO, the Norwegian Directorate of Health, the Norwegian Institute of Public Health, Dagens Medisin, ScienceDirect, Springer Link, NHS UK, NIH, forskning.no, Wiley, CDC, MDPI, BMJ, dfo.no, europa.eu, ResearchGate, PLOS, BioMed Central, muskelskjeletthelse.no, JFSF, unit.no and skadefri.no).

Activation is important in early rehabilitation, in cases of hypermobility, in the prevention of musculoskeletal complaints and as a general health-promoting measure. It is about restoring and securing normal functions.

Capacity is needed when you want to perform; Hiking in the mountains with a backpack, running faster, heavier lifting, or simply handling tasks such as changing tires on your car with less backpain than last year. Capacity is also important for long-term injury prevention.

Huxel Bliven and Anderson reviewed more than 30 years of research in a 2013 systematic review published in Sports Health. They found that core dysfunction is often more about neuromuscular control than pure strength.

A good training plan integrates both. The starting point may be activation — teaching the body to respond in the right way. Then capacity is built so the system can tolerate load when life, work or sport demands it.

How to train both - in the right way

Movement quality matters. Try to develop a basic understanding of each exercise, ideally with both a goal and a clear purpose, so that the exercise makes sense. Start by building awareness of key points on the body, and try to get position of the knees, hips, lower back and neck right.

Begin with low load and low difficulty and tune in on a correct technique.

Then increase the demand: make the exercise heavier, train on more unstable surfaces, combine several planes of movements at the same time, or increase the level of difficulty. Ideally, this may include unilateral loading and elements of rotational movements, without compromising on a good technique. This is functional capacity.

Avoid a common trap: getting stuck in the activation phase – without realising. Static training in stable positions provides very limited stimulus and training effect for the body and the core muscles (McGill, 2003; Manchado, 2017).

Ten weeks of static plank will not necessarily build more force or core capacity. At best, it may improve your ability to tolerate the discomfort of lactic acid build-up. At worst, it may train the body to override warning signals from the back — signals that may be telling you the core muscles are fatigued and that injury could occur.

The body adapts to the demands you place on it. If your goal is to increase core capacity, the core should be trained within a broader functional context, following the same principles as traditional strength training: safe technique, higher and progressive loading, with a relatively low number of repetitions.

According to research, recommended principles for core training include asymmetrical, dynamic and integrated exercises, with movements across several planes. Ideally, these exercises should also challenge balance and control (Saeterbakken, 2011; Manchado, 2017).

The focus should be on using body weight as resistance, unstable surfaces, functional and integrated exercises, and a clear demand for dynamic stabilization. Progression is key.

Download the Core Capacity app to access programmes that cover the full spectrum — from activation to dynamic capacity building.

We see early signs in our recent research (Pilot 1) that different core exercises target different core muscles. These findings might have implications for how we understand and plan core training to specific needs- and sports in the future. -We will do a follow up article on this issue. (Our article was accepted on the 12th of June 2026 for publication in Frontiers in Sports and Active Living. To be continued 😉

Conclusion: two sides of the same coin

Activation and capacity are complementary phases in a continuum. Activation provides the foundation: correct timing, reflex activation and neuromuscular control. Capacity provides robustness: the ability to tolerate load, perform well and increase the body’s total output, while maintaining dynamic stabilization of the base of the body at an optimal level.

The next time you read about core training, ask yourself: is this about waking the muscles up, or is it about making them stronger and more capable? The answer determines which dose, intensity and progression that will make sense for you.

References

About CoreCapacity AS

CoreCapacity Ltd communicates knowledge about how modern core training can influence people’s perceived health in a way that makes sense. The goal is to help people make good and informed choices about what they can do to achieve, maintain and improve their own health — and to build good, lasting training routines for the core musculature.

CoreCapacity provides low-threshold exercises that are simple and safe to perform. At the same time, they are placed within a progression system, and they are sufficiently advanced for the core muscles to be activated automatically. With increasing load and difficulty, the exercises may contribute to better function, health and physical robustness, as well as improved performance.

Parts of the original Norwegian text were compiled with support from AI.